The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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-Publisher SEC

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-Number 210

-Section 02

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The amount authorized by an entity's Board of Directors under a stock repurchase plan.

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The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

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Earnings Per Share Disclosure [Line Items]

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Share Based Compensation Arrangement by Share Based Payment Award, Outstanding Award as Percentage of Shares Issued

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The number of common shares issued as part of the Special Dividend.

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Special Dividends Paid.

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Special Dividend Payment Date Day Month And Year.

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NET EARNINGS PER SHARE - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share Disclosure [Line Items]
Net earnings per share, basic	$ 0.29	$ 3.52	$ 0.49	$ 4.49
Net earnings per share, diluted	$ 0.29	$ 3.50	$ 0.49	$ 4.48
Special dividend paid		$ 5,600,000,000
Special dividend, number of common shares issued		324,000,000
Special dividend, payment date		Sep. 01, 2010		Sep. 01, 2010
Stock Repurchase Plan 2008
Earnings Per Share Disclosure [Line Items]
Stock repurchase program, shares repurchased	1,199,800
Stock repurchase program, shares repurchased value	20,000,000
Stock Repurchase Plan 2011
Earnings Per Share Disclosure [Line Items]
Stock repurchase program, authorized repurchase amount	250,000,000
Stock repurchase program, shares repurchased	589,824
Stock repurchase program, shares repurchased value	9,000,000
Stock repurchase program, remaining authorized repurchase amount			$ 241,000,000
Performance share units \| Maximum
Earnings Per Share Disclosure [Line Items]
Final number of shares awarded of each grant's target	150.00%		150.00%